Water Quality and Conservation Unit Test
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Question
In 3–5 sentences, identify one human activity that has increased the amount of lead in drinking water. Then explain the water filtration method best suited to remove lead from the drinking water supply.(4 points)
One human activity that has increased the amount of lead in drinking water is the use of lead pipes and plumbing systems in older buildings. The best water filtration method to remove lead from the drinking water supply is activated carbon filtration. This method effectively removes lead by adsorbing or trapping the lead particles on the surface of the carbon filter. Additionally, reverse osmosis systems can also be used to effectively remove lead from drinking water.
Water Quality and Conservation Unit Test
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Question
Sara is working on making her house more eco-friendly. She has a number of upgrades she wants to make such as replacing her toilet that uses 5 gallons per flush with a new toilet that uses 1.2 gallons per flush. She also wants to replace a leaky faucet in her kitchen. Finally, she would like to replace her old washing machine that uses 35 gallons of water per load with a new high-efficiency model that only uses 10 gallons per load.
Which item should Sara replace first and why? Support your answer with evidence and reasoning.
(4 points)
In order to determine which item Sara should replace first, we need to consider the potential impact on water conservation. While all three upgrades are important, replacing the toilet that uses 5 gallons per flush with a new toilet that uses 1.2 gallons per flush would have the most significant and immediate impact on water conservation. To support this fact, we can consider the average number of flushes per day. If Sara flushes the toilet just 5 times a day, the water savings would be (5 - 1.2) x 365 = 1557.5 gallons in a year. On the other hand, replacing a leaky faucet or an old washing machine would also conserve water, but the impact would not be as significant as that of a high-efficiency toilet. Therefore, replacing the toilet should be the top priority for Sara's eco-friendly upgrades.
Water Quality and Conservation Unit Test
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Question
What caused the change in water quality in Flint, Michigan?(1 point)
Responses
The city was taken off the Detroit water system to save money.
The city was taken off the Detroit water system to save money.
City officials decided to stop fully treating the water to save money.
City officials decided to stop fully treating the water to save money.
The Flint River became contaminated which caused lead to get into the water.
The Flint River became contaminated which caused lead to get into the water.
City officials ignored the Clean Water Act and allowed wastewater to be dumped into the river.
The correct response is:
- City officials ignored the Clean Water Act and allowed wastewater to be dumped into the river.
Water Quality and Conservation Unit Test
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Question
Which data help hydrologists predict floods? Select the two correct answers.(1 point)
Responses
water temperature
water temperature
impermeable land area
impermeable land area
dissolved oxygen
dissolved oxygen
snowpack
snowpack
nitrate levels
The correct responses are:
- impermeable land area
- snowpack
Water Quality and Conservation Unit Test
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Question
Which of the following occurred because of Flint's water crisis? Select the two correct answers.(1 point)
Responses
City and state officials immediately alerted residents of widespread danger.
City and state officials immediately alerted residents of widespread danger.
Rates of cancer skyrocketed among adults in Flint.
Rates of cancer skyrocketed among adults in Flint.
Dozens of people contracted a form of pneumonia known as Legionnaires' disease.
Dozens of people contracted a form of pneumonia known as Legionnaires' disease.
General Motors stopped using Flint's water due to corrosion of their machinery.
The correct responses are:
- Dozens of people contracted a form of pneumonia known as Legionnaires' disease.
- General Motors stopped using Flint's water due to corrosion of their machinery.